My attentive readers may have noticed that Firefox will just take the search term you entered and put it into the URL in place of the placeholder "%s". This way if you can't find a search box, you can still add a keyword search by bookmarking a URL, putting the placeholder "%s" in an appropriate spot, and assigning a keyword.

That's what I did with UPS, where I couldn't find a working search form on the website. So I snagged the URL Google uses when it does UPS tracking and manually assigned it a keyword.

Do you use any search keywords you'd like to share? Let me know in the comments.